How to open discovery search mailbox

Hey there, I have an exchange 2010-2013 migration going on and I am at the tail end and found that I did not migrate the DiscoverySearchMailbox yet, and it is 50GB in size.  
My user account was able to open it back when it was all on the 2010 exchange, but I cannot seem to open it through OWA since most all is over on the 2013 server now.

I want to reduce the size before moving so I thought I would log into it and get rid of the searched and logs to slim it down.

Is there another way to do this, or how can I log into it now with the above described scenario

Thanks
bcameron70Asked:
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Hello WorldCommented:
Hi,

How about run below command without Arbitration parameter to move discovery mailbox?
New-MoveRequest DiscoverySearchMailbox* -TargetDatabase "Databasename"
More details about it, please refer to: https://social.technet.microsoft.com/Forums/office/en-US/7ea4baed-1c9a-4e0e-8ff3-14b2cd025582/migrate-discovery-search-mailbox-from-exchange-2010-to-exchange-2013?forum=exchangesvrdeploy

If the issue persists, please post the relevant error message for further troubleshooting.
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Will SzymkowskiSenior Solution ArchitectCommented:
As long as you have access to this mailbox do the following..
- login to OWA (using your account)
- In the Top Right Corner, (Where you name is)
- There is a little drop down arrow, click that
- It will open a windows to Open Other Mailbox
- Type in the Discover Search Mailbox in there and it will open

provided that you have the appropriate permissions.

Will.
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